Tennessee scored one run after a rain delay, but the Lady Vols could not overcome a slow start, falling to Oklahoma 8-1 in Game 1 of the Norman Super Regional on Friday.

No. 10 seed Tennessee (45-11) scored its lone run in the top of the fourth inning after a 2-hour, 37-minute rain delay. No. 7 seed Oklahoma scored single runs in the first, second, fourth and fifth before adding four runs in the sixth inning.

The super regional is a rematch of the 2013 NCAA championship series, which was won by the Sooners.

Oklahoma (48-10) struck first with one run in the bottom of the first. With runners on first and second and two outs, Georgia Casey hit an RBI single, plating Destinee Martinez to give OU a 1-0 lead. Ellen Renfroe closed the door on the inning when she sent Whitney Ellis down swinging in the next at-bat.

Oklahoma added another run in the second inning after Callie Parsons hit a leadoff double. Two batters later, Erin Miller drove her in with a sacrifice fly to center field.

The game went into a lightning delay in the bottom of the third with two Oklahoma runners on and two outs. Rain followed and delay the game until play resumed at 9:45 p.m.

Tennessee came out of the rain delay strong. With two runners aboard in the Oklahoma third, Renfroe induced a lineout to short to end the inning.

In the top of the fourth, Annie Aldrete hit a one-out double to the wall in right center, Melissa Davin followed with a bloop single to right center and Lexi Overstreet clubbed an RBI single off the top of the right-field wall to score Aldrete and pull UT to within 2-1.

Oklahoma responded in the bottom of the fourth with one run to push its lead to 3-1. Two errors and a walk loaded the bases with one out for Lauren Chamberlain, who hit an RBI single to center field. Martinez was out on the play after a base-running mistake.

The Sooners opened the bottom of the fifth with a solo homer to center field by Brittany Williams to stretch their lead to 4-1. They added four more runs in the bottom of the sixth to seal the win.

Tennessee and Oklahoma will square off in Game 2 today at 4 p.m. on ESPN. If necessary, Game 3 will be played at 7 p.m. or 45 minutes after the end of Game 2 and will air on ESPN2.